During the Tokugawa period ( 1600 – 1868 ) the Ainu became increasingly involved in trade with Japanese who controlled the southern portion of the island that is now called Hokkaido.

During pregnancy, the cervix is blocked by a special antibacterial mucosal plug, which prevents infection, somewhat similar to its state during the infertile portion of the menstrual cycle.

During this holiday the Torah portion containing the Ten Commandments is read in the synagogue, and the biblical Book of Ruth is read as well.

During the 1990s, FARC expanded its operations, in some areas, to include trafficking and production, which has provided a significant portion of its funding.

During this period, he served in the 81st, 82nd, 83rd, 84th, 85th, 86th, 87th, and a portion of the 88th Congress.

During their stay, a large portion of Serbian soldiers died from exhaustion, food shortage, and various diseases.

During the Bronze Age in this region, the Kârum was a portion of the city that was set aside by local officials for the early Assyrian merchants to use without paying taxes, as long as the goods remained inside the kârum.

During the Russian Civil War, Cossack regions became centres for the Anti-Bolshevik White movement, a portion of whom would form the White emigration.

During the whole of this time he scarcely ever moved from his house, except to the prison and back, and the result of a portion of his labors was discovered to his friends in conversations and experiments relating to electrical phenomena, which revealed to them the fact that, alone and unaided-from the sheer force of his genius-he had discovered as early, if not earlier, than Morse or Wheatstone, the principles of the present system of electric telegraphy.

During the Roman Empire, the region was part of the Citerior Tarraconese province, except for the south-west portion of it, which belonged to Lusitania.

During the Polish Defensive War of 1939, the main portion of the defenders of Westerplatte as well as the armoured brigade of General Stanisław Maczek were either from Kielce or from its close suburbs.

During the war, American turncoat Benedict Arnold raided Harrison's Berkeley Plantation, burning the Harrison family portraits and antiques, and a large portion of the Plantation itself.

During the 1904 gubernatorial race, the strongest candidate, Napoleon Bonaparte Broward, based a significant portion of his campaign on draining the Everglades.

During the process of clotting, milk-clotting proteases act on the soluble portion of the caseins, κ-casein, thus originating an unstable micellar state that results in clot formation.

During Virginia's Colonial Era, the area which later became Mathews County was a portion of Gloucester County.

During the course of a fire that destroyed most of Uppsala in 1702, a large portion of Rudbeck's writings was lost.

During the Tribal Council portion of the episode as aired, these votes and confessionals are not all shown ; this is done to maximize the suspense of the pending vote tally.

** During the pre-merge portion of the 2006 season two former contestants returned to the game to lead the tribes.

** During the 1998 and 1999 seasons, during the pre-merge portion of the competition when a tribe lost an immunity challenge the opposing tribe would vote to eliminate one of their members.

During the merge portion of the competition whenever someone was voted out before they left tribal council they would cast one more vote.

During the 1930s a significant portion of the quarries were developed by Royal Engineers for the storage of munitions.

During the early-to-mid-19th century, wealthy sport anglers in the United States ( mostly located in the northeastern portion of the country ) largely confined themselves to trout and salmon fishing using fly rods.

During the floods of 1912 and 1927, however, the southern portion of the town, including the main business district, remained dry, as the flood waters to the north and east were held back by the Texas & Pacific Railroad embankment.

During the night the fire spread quickly and wiped out a large portion of downtown.

During the twentieth century, the town was the site of a portion of the landing strips of the South Weymouth Naval Air Station.

During this precarious period of development the mother should continue to influence the growth of the child's conscience.

During the period from 1 July 1960 through 31 January 1961, additional research affiliations were effected with the U. S. Army Medical Research and Development Command to conduct research in procedures for quantitative electron microscopy, and for the study of biophysical and biological studies of the structure and function of ocular tissue.

During this period, a total of 762 exhibits were presented at 442 medical and scientific meetings.

During the period of this report, 37,470 new cases were entered into the various registries.

During this period, 7,827 teaching sets were distributed on loan.

During the period of this report, 63 panel exhibits depicting the latest developments in medical research were displayed.

During the period, the laboratory rendered centralized macropathological service to qualified requesters.

During the period from 1 July 1960 through 31 January 1961, the Medical Museum was required to move to Temporary Building `` S '' on the Mall from Chase Hall.

During the period of about 4 hours around sunset, skywave transmission conditions are building up until full nighttime conditions prevail ; ;

During the Civil War period Mr. Brown also invented the Brown & Sharpe formed tooth gear cutter, a basic invention which ultimately revolutionized the world's gear manufacturing industry by changing its basic economics.

During this period 7,484,268 members were received, yet the net membership now is only 9,910,741.

During the period of the Iberian Union ( 1580 – 1640 ), Portugal lost influence and power and made new enemies.

During the Romantic period, art came to be seen as " a special faculty of the human mind to be classified with religion and science ".< ref >

During the same period the Georgian states of Colchis and Tabal arose around the Black Sea and central Anatolia respectively.

During this same period, slave-holding border states had more free African-Americans and European immigrants than the lower South, which increased Southern fears that slavery was threatened with rapid extinction in this area.

During this period he published 18 plays and 3 novels, including the murder mystery The Red House Mystery ( 1922 ).

During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a trendy sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.

During the post-World War I period ski-lifts were built in Swiss and Austrian towns to accommodate winter visitors, but summer tourism continued to be important ; by the mid-20th century the popularity of downhill skiing increased greatly as it became more accessible and in the 1970s several new villages were built in France devoted almost exclusively to skiing, such a Les Menuires.

During the first 11 months of 2006, net imports grew by 21 percent to $ 1. 95 billion, while exports stood at $ 895 million, up 0. 3 percent from the same period in 2005.

During the first 11 months of 2006, the European Union remained Armenia's largest trading partner, accounting for 34. 4 percent of its $ 2. 85 billion commercial exchange during the 11-month period.

During January – February 2007, Armenia ’ s trade with Russia and other former Soviet republics was $ 205. 6 million ( double the amount from the same period the previous year ), making them the country ’ s number one trading partner.

During this period, spectator attendances dropped and media condemnation increased, but Simpson and Lawry flatly disregarded the public dissatisfaction.

During this period Agamemnon and his brother, Menelaus, took refuge with Tyndareus, King of Sparta.

During the Akkadian period, the Akkadian language became the lingua franca of the Middle East, and was officially used for administration, although the Sumerian language remained as a spoken and literary language.